Tapping machine



4 SHEETS-SHEET 2 A. PESTEL.

TAPPING MACHINE.

FILED MAR. 25. |918.

Feb. 13, 1923.

'Feb. 13, 1923. 1,445,166.v

A. PESTEL.

TAPPING MACHINE.

FILED MAH. 25. 191s. 4 SHEETS-$115513.

INVENTOR A. PESTEL.

TAPPING MACHINE.

I Feb. 13, 1923.

4 SHEETSSHEET 4.

INVENTOR Patented Feb. 13, i923.

nirI

ARTHUR rnsrnr.. or Naw YORK, Ne Y.

TAPPINC: BEACHINE.

Application filed March 25, 1918. Serial No. 224,520.

To all whom t may concern Be it known that L' Ania-inn ,Fnsrnnl a .citizen oil the TJnited States. residing at 557 TWest 124th Street, in the State, county, and city of New York, have invented new and usefulTapping Machine, of which the rollowing is a speciiication.

My invention relates to improvements in tapping machines and has as one oit its objects, the provision o1 a machine that can be placed in a horizontal.. vertical or any other desired intermediate position to perform the tapping operation. l

Another object and one ot the most vimportant, is the provision of an etlicient, yet

exceedingly simple and effective lubricating system, the arrangement ot which insures the exclusion off oil from between the *fricrtion surfaces of the tap` drive.

A 'further object is the provision of a hand tapping arrangement that can be used on large work. j

' A still further object is the provision ot a belt tightener that can be operated regardless ot the position the tapping machine is in. i

rllhe objects are obtained by the mechanism ott which the following is a description and which is illustrated inthe accompanying` drawings in whichv Figure 1 is a sectional front view/.the section being taken at A A, Figure 3, looking in direction of arrows. j

Figure 2 is a side elevation of Figure 1. Figure 3 is a plan view. V

Figure 4 is an illustration showing the tapping arrangement placed in its eXtreme positions.

Figure 5 illustrates the belt tightening device'in a section taken at B-B Figure 3.

Figure 6 showns the idlenpulley and its lubricating arrangement in sections.

Figure 7 is a plan view ot the work table and the table guide. f

Figure 8 illustrates in a section the lock-l ing arrangement ot the table and table guide.

Figure 9 yis a plan view olf the adjustable table support and its operating mechanism,

Figure l0 is a modificationvr of Figure 17 illustrating a different construction o'f the tapping mechanism. Y;

Figure 11 illustrates the hand tapping rod. l

or otherwise secured.

coefficient. y j discs 16, the perforatlons 17 in the steelplate Like reference letters to like y'parts throughmit the several views.`

.My tapping machine consists o-a hollow spindlel, yboth ends of vwhich are turned oit y ure 1. A chuck in ofrmo a clamp or other suitable `device 4 is fastened tol the lowerend oft spindle 1 by ymeansof af screw 6.

4 is provided with a vertical slot 7', Figure 2, and ahorizontal slot ,8, Figures 1 and 2. This clamp 4 has at its lower end a threaded projection 9which is engaged by a tapholder 10 into which the tap 11 is soldered,` driven,

- lt will be seen, that. lthe rchuck thus described is oli especially light design, which quite necessary when taps of small diameter are used. llhen suddenly stopped, the im-v pact of a heavy chuck, on account of its mass, will turn the spindle a vshort distance further and is therefore more liable to break the tap. y M

In order togive the tap 11 vthe required forward and reverse motion when tapping work.` the spindle 1 carries a friction member 12. This friction member consists'ota perforated'steel'plate 13j which is riveted to a collar 147 which in turn `rests on a shoulder 15 otspindle 1.and is preferablyshrunk on, "iveted on, or otherwise held in place by suitablemeans. The steel plate 13 carries at its upper and lower surfaces `iriction discs 16, preferably made of leatherA or some other kind of material with a high friction In order to secure the Jfriction 18, Figure 3, are filled out with small leather pads 18,' Figure 1, to whicht'he discs are glued.

The y j tween two in opposite directions revolving Friction blocks 19 and-20. These tri A blocks are j )referably made oit hard wood.

it is, however, understoodthat they 4cmild be made of any other friction-prcnlucing material. or specially 4.prepared si itaces The friction blocks 19 and 2t) are carried by rope pulleys 21 and-22 to which they are fastened by means oi" screws 23. "Rope pul-v leys 21 and 22 revolve on the stationary' bushings 2 and?) wh-iclrare provided with shoulders 24 and v25 which serve for holding the pulleys in place.; They bushings@4 'friction member 1 2 is situated be-V -In orderto obtain the clamping eife'ct', part` H j so l.

ica`

'and E() and screws 3l, yFigure 2.

tappingy arrangement. to the swivelhead 38 by means of ears 39 and l-O', Figure 2, thereby forming one complete unit of the tapping mechanism and the work table. These ears 39 andll) are cast in one piece with the swivelhead 38 and are made so as to lit between'the vbearings B-l and 35 of support- By means of the swivelhead 38 the tapping mechanism may be placed in either a horizontal, vertical, or any other desired intermediate position, Figure 1l. For this purpose the swivelhead 38 is piif'oted on the head 4l of the main dri-ve bushing; l2, which is screwed to the base plate f3 by j means of screws dll@ A shoulder l5 on the main drive bushing l2 serves -for holding the swivelhead 36 in place and against a projection i6 of the base plate 41:3, Figure 3.

There is, of course, sufficient play between.

shoulder and projection t6 to allow an easy movement of the vswivelhead. ln order to vbe able to lock the tapping" vmechanism in the desired position a semicircular slot l? is provided on `the swivelhead 38, Figure l, through which a threaded bolt 16 passeswhich engages in a correspondingly threaded holeA 49, located in an extension of the base plate 4,3, ,Figure fr .vashe 5l is advantageously placed underneath the head of the bolt d8. To swing` the tapping arrangement into the desired position bolt i8 is loosened and after the desired position is obtained again tightened.

The drive of the tapping' niechanisuris illustrated in Figure 2?. It shaft 52 is `driven in the direction indicated by the arrows by a pulley 53, or by a motor directly connected to the motor shaft in any well known manner. Shaft 52 carries on its other end a rope pulley Trl. lcower is transmitted to the rope pulleys 2l and by means of a belt 55 which runs orer :in idler pulley :36. By this arrangement the rope pulleys 2l and 22 are driven iu opposite direetionr-i, pulley 2l rotatingiu a clockwise. and pulley 22 in a conintewlochwise direction. The idler pulley is loosely held in place between two aru'is 37 and 56 of v swivelhead 38 by means of a bracket to which the pulley is attached by nie .i vof a shoulder bolt and nut 6l, llig'ure 6.

The bracket has pivots 62 and M6555 ou z which it swine@ in openings and-65 et the arms 57 and 58. U'ienino 6s is shaped The work table 37 is' as shown in Figure also as to pen'iit the bracket 59 with idler pulley 56 to be put in pla-co.

In order to insure satisfactory lubrica-v tionof the running surface 66, Figure 6, of Vthe idler pulley :T36 boli; 60 contains a chamber 67 which is filled with resse or other suitable lubricant and 'which is kept closed by means of a threaded plug 68. The lubricant reaches the running surface 66 through holes 69 through which it may be forced by turning the plug` 68.

To facilitate'the location and tappingl et work a table 37 is provided7 Figure 2.' The lwork is placed either on the upper or' lower surface ofgtable 37 depending` on the shape and kind of work to be tapped. After lecating; the workon the table in such a way that the hole to be tapped is .directlyoif'er a slot 70 in table 37 the table is moved up `toward the tap 11 until the tap ontersrthe -ated between the friction blocks 19 and il() which revolve in opposite directions. The distance between these two bloc rs is seinewhat larger than the thickness of' the friction member l2, thereby formingn a space 7l, l

VFigures l and 2, sufficient to allow the fric tion member to be moved up and down and to be'engaged and disengaged with either of the friction blocks 19 and 20.

The table 37 is supported on a table rod 72 which slides in two bearings 7 3 and 74 of the support 75, Figures l, 2, and 9, which is adj ustably clamped to rod 36, with its slot-ted bearing 76. To facilitatethe clamping and adjustment of the height of table 37 a threaded bolt 77 4is securely fastened in ,boss 78 of table support 7 5 and passes through a hole 79 ot' boss 80. By' looseningand tight,- ening the handle 8l the table support 75 with table 37 may be adjusted in any desired position on rod 36. ln order to `give the l table 37 sullicient rigidity while being' movedv up and down a guide 82 is providechFlgures l., 2, 7 and tl, the` fork Sil of which slides ou rod 56. This guide is clamped to the collar 84 by screw 86, which partially engages-in a groove B7 of collar 941-, Figure S. rlfhrough may be varied to meet different requirements. ln the device illustrated in the drawing a lever 151, Figures 2 and 9 is pivoted on bolt 7T and is formed to a fork 152 which engages collar 88 on table rod 72. A chain 153 is connected to the end of lever 151 which is fastened to a suitably located treadle (not shown on drawing) for foot operation.

Special attention.had to be given to the lubricating system in order to secure perfect lubrication of the different 'bearings while the machine is ruiming ina vertical or horizontal position. At the saine time care had to be taken to prevent oil from reaching the friction surfaces 16 of the friction member 12 as this would materially decrease the working efficiency of the machine. For this purpose oil cups 90 and 91 are provided on the friction member 12, which catch the oil emerging from between the bushing 2 and the hub 92 of pulley 21. The' lubricant is brought to the'rnnning surface of hub 92 from a reservoir 93 in bushing 2 through a passage 91, and in order to guide the superfluous oil into the oil cup 90 a guide 95 located between the hub 92 and block 19 which 4reaches w`th its end into cup 90, thereby tl'euslj/ flared so as' to insure a throwing.

off of the oil against the inner walls of cup 90 through the action of the centrifugal force, while the machine is running. F rom the cup 90 the oil is drained through holes 96` and lguided into the reservoirs 97 by means of cup 91 which is also flared out for the same reason as guide 95. The lubrication of the runningsurface of hub 98 of pulley 21 is obtained by draining the oil in reservoir 9T through a numberr of slots 99 in hub 98. ln order to lubricate the spindle bearing 100, a hole 101 is drilled through bushing` 3 through which oil passes to said running surface. To insure perfect lubrication of the hubs 92 and 98 the bushings 2 and 3 may have helical oil grooves cut into their surfaces.. `When the machine is running in a horizontal position oil is supplied to the bearings by conveniently located oil holes 102. .Iinyoil that should emerge from the runningsurface would be guided; into the reservoirs 9H and v103 formed by the blocks 19 Aand* 20 from whiclr any accumulating oil would be `thrown off through tubes 1041-.' The amount ofoil,however. Tfvhich wouldreach the reservoirs, while `the machine `is running ina horizontal positionis negligible, as Vthe oil would have a tendency to stay in the bearingsitherefore the o'il Jthrown off through the tubes 1'01'vvouldnot interfere with the operation of the mafchin'ejy It is, at times, necessary tighten belt 55, and in order to Ydo this withoutloss of time break.

and without lhavingto resort to the ordinary and troublesome means of shortening the belt the arrangement described in thefol-r lowing' is provided. The swivelhead 38 has two lugs 10/1 and 105, Figure 5. A threaded bolt 106 passes through lug 101 land rests with its rounded end 107 against a bolster 108 of y'arm 32. Another threaded bolt 109 ypasses through an opening` 110 in arm 33 and engages lug'105 of the swivelhead 37. A partially roundedwasher 111 is placed un-` der the head of bolt 109, the purpose of which willbe explained presently. Should it be required to tighten the belt bolt 109 is first loosened, by which action the support 28 is free to swing in its bearings 31 and 35 on rod 36. The slack in the belt is then taken up by turning bolt 106 until the belt is sufficiently tightened. The support 28 is then again rigidly secured by tighteningbolt 109, the washer 110 adjusting itself to the displacedposition of the support and holding itiirmly, thereby practically forming one unit with the swivelhead 38. The herewith described belt tightening arrangement will also prevent damage to the machine and work, as well as injury to the operator, as none of the parts is able to move from its occupied position in case the belt should It is, of course, understood that above belt tightening arrangement may be left out and that support 28 and swivelhead 38 may be made in one piece if so desired.

in certain work, especially when tapping large sized holes and where lthe machine may not have been made large enough for tapping such holes with power. it may be desirable to do the tapping by hand or by means of a hand tapping machine, and therefore provisions were made on the machine described on the preceding pages to change the machine from a power tapping machine to a hand tapping machine. obtain this condition clamp ,f1 with tap holder 10 and tap 11 are removed anda :rod 112, Figure 11. with a crank 113 put through the hollow of the spindle 1. The crank 113 is adjustable in the head 114i of rod 112 to accommodate the tappingof large and small holes` and can be secured in the desired pol sition by set screw 115. Tap holder 10 with tap 11 are then screwed ontothe threaded extension 116 of rod 112.

lhen this arrangement isuseditisnot necessary to'bring the work against theta'p, therefore it is desirable to'have thetable 37 stationary. For this purpose the bearing 7 is formed as aclamp by insana-'of which table 3"(y maybe secured.A The bearing 7 3 is splitas shown at 117. Figure), a threaded bolt 118 with'handle 119 is provided to 'op'- crate-the clai'np.Y` V 'f 'Figure 10 is*zi-'modificationv ofy Figure 1, the principle of which is the same and only differs constructively. f

1n order to blocks yferently from the ones previously described.

The object of thisl construction is to siniplify the oiling system which is obtained by designing the driving pulleys, and friction as well as the oil cupssomewhat difldescribed.` The friction member 126 is built up similar to the one explained in Figure 1 and is riveted to a collar 128 on spindle 120. The friction member is actuated by frietion blocks 129 and 130, which run in opposite directions and which are 'fastened to the rope pulley-s 131 and 182 by means of screws 133 and rotate on the bushings 121 and 122. rlhe rope pulleys 121 and are driven in the same manner as the pulleys shown in Figures 1 and 2.

As in Figure 1 the lubricating oil is placed in a similar constructed oil well 134 from where it is brought to the running surface 135 of bushing 121 through a passage 186 and evenly distributed over the entire'run ning surface by means of helical oil grooves 137. The overflow of the oil emerges at 138 and is prevented from reaching the friction surfaces of the driving member 126 by an oil guard 127 which is fastened to the before mentioned frictioninember. The oil thus caught in cup 121i is drained olf through holes 139 in the bottom of the cup and collar 128.` An oil cup 140, similar to 127, is provided on the lower surface of the collar, which prevents the oilv from being thrown onto the friction surfaces and guides it into reservoirl 41 of the pullev ln order to lulnicate the running surface of hub 142 of pulley 132 oil is drawn from this reservoir through a passage 143 and is distributed over the running surface by means of helical grooves 144 and 145. Oil is delivered through passage 143 to the running surface son'iewhat below the collar 146 of bushing 122 and the tendency of the oil would be to llow toward the lower 'end of said bushing when ruiming in a horizontal position, the oil grooves 14.4 and 145 are arranged in such a manner that their ends are in line with passage 1453. rThrough this arrangement positive lubrication'of the part of the bushing above passage 143 as well as of the part below is assured. Oil groove 145 is connected 'with a passage 147 in bushing 122 to which oil is carried to the lower bearing of spindle 120.` Vilhen the machine is running in a horizontal position the oil will tend to remain in the bearings and no oil or very little will emerge from between the Lalla-iso shoulders of the bushings 122 and 123 and the hubs o'l' the pulleys 131 and 132. Should there, however', be an overflow of oil, it would be Vcaught in the cups 138 and 140 and thrown olf into the reservoirs 141 and 148 for which purpose the ends of the cups are flared out. ris the oil is thrown olf the flares of cups 138 and 140 it is caught in a recess 149 of friction blocks 129 and 130 which is shaped so that the oil will easily flow into reservoirs 141 and 148. lf it should be found advisable said reservoirs could be provided with drains similar to the' draining tubes 104, Figure 1, by meansof which an excessive accumulation of oil would be prevented.

l do not wish to limit myself to any particular construction of friction members and surfaces, means for preventing' the oil from reaching saidy friction surfaces, for swinging, adjusting,A operating or driving of the herein described tapping machine, as it will be obvious that the construction may be varied considerably without departing from the spirit of my invention as set forth in the claims.

Having now particularly described and y ascertained the nature of my said invention.

and in what manner the same is to be performed l declare now that rwhat l claim is:

1. ln a machine of the character de-` scribed, a mounting, a swivel-head supported by said mounting, a pivoted support carried by said swivel-head, bushings hired in said support, one of said bushings being formed to provide encircling passageways 'for the conduction of a lubricant, a rotating and axially movable spindle mounted in said bushings, a` friction drive consisting of two oppositely driven members mounted on said bushings, friction surfaces on said members, a friction disc fixed to said spindle and adapted to engage said friction surfaces, a threading tap carried on one end of said spindle, a rod carried by said swivelhead, an adjustable support mounted on said rod, an axially movable table carried by said support, a lever pivoted on said sup port and engaging said table, and means on said table for limiting the axial movement thereof.

2. In a machine of the character described, a mounting, a rotatable swivel-head supported by said mounting, nieans to ylock said swivel-head to said mounting in. any position within a swing of 1800, a rod cai'- ried by said swivel-heathen adjustable table support mounted on lsaid rod, an axially movable table rod carried by said support, a table fixed on one end of said table rod, a collar on said table rod for limiting the movement thereof, and a lever having pivotal connection with said table support and engaging said collar.

3. ln a machine of the character dellO scribed, a mounting, al rotatable swivelhead supported by said mounting, means to lock said swivel-head to said mounting in any position within a swing of 1800, a rod carried by said swivel-head, an adjustable tablesupport mounted on said rod, a table carried byv said support, and means for moving said table in relation to said support.

4. In a machine of the character described, a mounting, a rotatable swivel-head supported by said mounting, a threading mechanism mounted on said swivel-head, a rod carried by said swivel-head, a table support carried by said rod, a table mounted on said support, and a guide fastened to said table and engaging lsaid rod.l

In a machine of the character described, a mounting, a swivel-head movable on said mounting, a spindle carried by said swivel-head, a threading` tap fixed at one end of said spindle, an extension'mounted on said swivel-head, a support carried by said extension, an axially moveable table mounted in said support and means pivoted on said support for actuating said table.

6. In a machine of the character described, aI mounting, a swivel-head moveable on said mounting, a spindle rotatable in two directions by said swvelhead, an extension on said swivel-head, a support carried by said extension, a `moveable table mounted in said support and means carried by said support for actuating said table.

7. In a machine. of the character de-y scribed, a spindle, a friction drive consisting of ltwo oppositely driven members revolvably mounted on said spindle, friction surfaces on said members, a friction disc mounted on said spindle and adapted to rotate between said friction surfaces, oil cups on said friction disc and an oil guide mounted on one of said driven members and eX- ten ding into one of said oil cups.

8. In a machine of the character described, a revol able and axially movable spindle, a friction drive consisting of two oppositely driven members, friction surfaces on said members, a friction disc mounted ou said spindle and adapted to engage said friction surfaces, oil cups 0n said. friction disc and an oil guide, having an outwardly flared edge, mounted on one of said drivenv members.

,9. In a machine of the character described, a spindle, a friction drive consisting of two oppositely driven members revolvably mounted on said spindle, friction surfaces on said members, a. friction disc mounted on said spindle and adapted to rotate between said friction surfaces, oil; cups on said friction disc and an oil guide mounted on one of said driven members. y

10. In a machine of the character described, a spindle, a friction drive consisting of oppositely driven members, a friction` disc mounted on said spindle and 4adapted to engage said friction surfaces, o-il cups on said friction disc and an oilguide m-ounted on one of said driven members. g

11. Ina machine of the character described, a spindle, a friction drive consisting` of vtwo reversely rotating driven members, friction surfaces onsaid members, a friction disc mounted on saidspindle and adapted l f to engage said friction surfaces, oil cups mounted on said friction disc and a passageway connecting said oil cups forinedin said friction disc. v

12. In a machine of the character described, a revolvable and axially movable spindle, a friction drive revolvalile on` said spindle and comprising two oppositelyY driven pulleys, friction blocks mounted on said driven pulleys, friction surfaces on said friction blocks, a friction disc mounted on'y sad spindle and `adapted to revolve between said friction surfaces, voil cups mounted on said friction disc, and an oil guide mounted on-one of said friction bloclrs.

18. In a machine of the character described, a spindle, a friction drive mounted' on said spindle and comprising friction' members, friction surfaces on said members,

a friction disc mounted onsaid spindle and adapted to engage the surfaces of said members, and oil cups mounted on said friction disc, the latter being formed to provide a passageway between said oil cups. g

14:. In amacliine of the character described, a friction drive consisting of two reversely rotatable members, friction blocks having friction surfaces mounted thereon, said friction blocks being constructed so as to form reservoirs on the side opposite their friction surfaces, a spindle, a friction disc mounted on said spindle, and oil cups mounted on said friction disc.

15. In a machine of the character described, an adjust-ably mounted support, a spindle mounted therein, a threading mech- :mism mountedon oneend of said spindle` a friction drive/mounted on said spindle and `and consisting` of two reversely rotatable members, friction surfaces on said members, a friction disc mounted on said spindle and rotatable between said friction surfaces, oil cups on said disc and an oil guide mounted on one of said members.

ioo

i ic

`ljln e machine of the character described, an adjustable piveted support, at Spindle mountedon said support, e friction drive Consisting of two driven pulleys mounted on Said spindle, a, drivingv .pulley mounted in i fixed bearing, un idler pulley mounted in a Self-adjusting Support, suiteble belting to operate Said driven pulleys inopposite dreetione through `the medium of seid idler pulley9 und ineens for adjusting the tension on seid belting.

l. ln a machine of the character deeeribed7 a spindle, :L friction drive consisting t two reversely rotating members, frieton nrf'eees on Suid members7 a friction member engaging Said surfaces, saidk irietion member comprising; e perforated plete, Said perN iorations Containing e, plurality of pads of light materiel, dises oi? -material lie-ving' n high ifrietionzil eoeihieient, fixed on either side oli Suid plate and enga-ging seid pads; and e,

threading tap Carried on one end of Said sgindle.

19. In a. machine of the character described, e mounting7 e Swivel-heed hzivng pivoted connection to seid mounting` and capable oi edjuetnient in relation thereto, e Support pivotelly mounted en Seid Swivelhezld, en axially moveable spindle carried by said support, and e threading;Y tap mounted on one end ei said Spindle.

20. ln e machine of the Character described, an adjustable swiiiging support, a rod, carried on one end of Seid support, :i

table support and table reeriied by said red,

and en axially movable threading meehanieni mounted on the other` end ofeeid sup- Port'- Signed at New York, in the county el' New York and State of New York, this 23rd dey of Merch, A. D. 1918.

ARTHUR )ESTEL 

